Magnetocaloric effect in a Fe–Mn–Ga alloy.

Authors :: Kastil, J.
Kamarad, J.
Kolomiets, A. V.
Konoplyuk, S. M.
Kozlova, L. E.
Perekos, A. O.
Dzevin, E.
Source :: Journal of Applied Physics; 6/28/2024, Vol. 135 Issue 24, p1-6, 6p
Publication Year :: 2024
Abstract: A magnetocaloric effect (MCE) due to adiabatic change of temperature was directly measured in an Fe<subscript>47.1</subscript>Mn<subscript>26.1</subscript>Ga<subscript>26.8</subscript> alloy undergoing martensitic transformation. Its values in the high-temperature region were positive, while in the temperature range below temperatures of martensitic transformation, the adiabatic change of temperature in the magnetic field was negative. The x-ray diffraction analysis revealed the presence of a Heusler L2<subscript>1</subscript> (B2) phase and a γ-phase in the Fe<subscript>47.1</subscript>Mn<subscript>26.1</subscript>Ga<subscript>26.8</subscript> alloy above temperature of martensitic transformation. The features of field-dependent magnetization and temperature variation in MCE indicate the occurrence of ferromagnetic-to-antiferromagnetic transition in the γ-phase, which is responsible for the observed inverse magnetocaloric effect. [ABSTRACT FROM AUTHOR]